324 
ANNALS OF THE MISSOURI BOTANICAL GARDEN 
[Vor. 8 
is striking and analogous to what resulted with Botrytis. 
E . /a'e NX CM / ~~ 
N 15*e. x_/ | 
i i — eL aie J à TX M / Nai 
LNN 
$40 r ` 
Y I 
H 
i, [1 M 
y | N 
fy t 2 3 + s 6 7 8 9 
Fig. 24. Puccinia graminis in sugar beet decoction. 
The expansion of favorable range on the alkaline side in water 
A 
slightly acid or neutral reaction, on the whole, decidedly stimu- 
lates the germination of these spores. 
Of the forms studied, Fusarium sp. is the only one that de- 
joo 
-——-—4 v. 
3 DE: \ Pn FA 
E éo —)J M zt t N 
È md " 
à ] ! me A 
I 7 — `“ 
Y 40 H gt 
` \ 
1 NIS 
r dot P 
40 T "- 
I d 
| «dc 
r 
E 
AB t 2 3 + s 6 7 ô 9 
Fig. 25. Puccinia graminis in “water HCl or KOH.” 
cidedly responds to an alkaline medium. This form, moreover, 
exhibits the widest range of germination with respect to the 
reaction of the medium, extending from Py 2.0to Px 10.0 +, the 
Maxima generally appear about Py 3.0- 
most alkaline culture. 
4.0 and near Pa 7.0. 
